Comminuting body



M y 31 .1932. R. c. N wHousE 1,860,393

COMMINUTING .BODY

Filed May 1930 Patented May 31,1932

* stares RAY c. nnwnonsn, or wauwerosa, wrsconsin, assienonfro ALLIS-GHALMERS j MANUFACTURING COMFANY, or MILWAUKEE, Wisconsin, A CORPORATION or DELAWARE Application filed Mayfii,

" make rol ing contact with the projecting portions of similarly formed ad acent bodies which coaction permits more of the power supplied to the grinding mill to be expended in reducing the oversizematerial rather than to still further reduce the material already sufficiently fine, thereby increasing the ethciency of the grinding mill.

It has been customary in the prior art to employ'several types of grinding bodies in.

comminuting mills of the tube and ball types.

With the use of the ordinary flint pebbles and r of iron spheres or balls, it has been found that there is ordinarily only point coaction between the adjacent bodies, thus eliminating the desirable comminuting effect which results from surface coaction. One of the types of grinding bodies of the'pri-or art whichappears to provide a desirable surface coaction is essentiallyspherical n form but having opposite spherical cavities. This type of'grinding body by reason of its con formation is however limited to be formed by casting or with the use of dies. To con struct the bodies by casting requires the eX penditure of considerable time while to construct them with the use of dies requires heavy and therefore costly forging machinery. The grinding bodies of the present invention can beformed by merely cutting off desired lengths from a hot drawn or rolled bar of steel having the desired characteristics and of a substantially spur gear shaped crosssection. i

A clear conception of an embodiment of the invention may be had by referring to the Fig. 5.

COMMINUTING Bony] 1930. Serial No. 455,594.

drawings accompanying and forming a part of this specification in which like reference characters designate the same or similar parts in the various views v 3 i Fig. l is a diagrammatic disclosure of a tube mill having the invention applied there- Fig. Qis a fragmentarysectional view of.

a portion of themill-and shows aplurality of comminuting bodies in grinding relation with a material to be'ground thereby.

Fig. 8 is an end view of the preferred form of, coinminuting or grinding body.

, Fig. 4 isa front view of the body shown in i Fig. 8.

Fig. 5 is an end view of a modified form of commmuiting or grlndlng body.

r 1g. 6 1s a front View of the body shown in zRefe'rring to Figs. 3 and etitwill' be seen that each of the ,comminuting or grinding bodies 1, is generally cylindrical and substantially, of a round tooth spur gear shaped cross-section. In order to effect a maximum surface coaction between the bodies, the ribs or tips 2 of each of the bodies 1 are are shaped, as shown at 3, as are also the furrows or toothrcot defining portions 4. The radii of these two arcsurfaces are preferably made equal and their centers to lie in the same circle of mean diameter so as to obtain the maximum rolling efiect, surface, coaction anduniform wearing qualities. Although the length. of the-body may be difiierent'for various mills andfmaterials, a length which is about twice that of the diameter of the mean diameter circle is the preferred length of the bodies.

When the grinding bodies lla-re placed within a mill grinding chamber they assume various positions asindicated in Fig. 2, the

ribs or tips of the teeth 2 of'some of the bodies having surface coaction with thefurrows or tooth-root defining portions 4 of adjacent bodies; (As, the mill is rotated, the ad acent bodies roll or slide relatively to each other atthe coacting surfaces and tend to reduce the material 5 between the-relatively moving bodies to a fine powder. The specific spur gear shape of the body provides not only an increased effective grinding surface in the intermeshed relation of the bodies but also permits of the body which has been raised and allowed to fall by gravitation to impart a rotary motion to those adjoining and thus increase their rolling activities.

Further the extensive surface coaction present in this form of comminuting body effects a very appreciable increase in the efficiency of the mill in which the body is used. Less power supplied to the mill will be expended in reducing those portions of the material already sufliciently fine and consequently more of the power supplied to the mill will be expended in reducing those portions of the material that are oversized.

It will further be noted that the uniform cross-section of the bodies permits their being constructed from hot drawn or rolled steel bars of considerable length by merely cutting the bar in the desired lengths and thus effect a great saving in cost of manufacture over what was required to form the bodies of the prior art which were either formed by casting or with the use of dies.

lVhile the bodies of Figs. 3 and 4 have been disclosed as having six ribs or teeth, it will be apparent that they may havea lesser number as for instance three as shown in Figs. 5 and 6.. This form of body 1 because of the lesser material intermediate the ribs or teeth is not as serviceable as the preferred form of body shown in Figs. 3 and 4.

It should be understood that it is not dedesired to limit the invention to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent:

1. As an article of manufacture, a universally tumbling comminuting body wherein parallel transverse cross-sections are sub- ,stantiallly alike and are bounded by curved lines which comprise joined alternately inwardly and outwardly disposed semi-circles of substantially equal radii and having their centers in the same circle.

2. As an article of manufacture, a universally tumbling comminuting body cylindrical in form and having longitudinal convex sen'n-cireularribs and longitudinal,

concave semi-circular furrows, the centers of which are on the same mean diameter circle and whose radii are substantially equal and the length of said body being substantially twice the diameter of said circle.

' In testimony whereof, the signature of the inventor is affixed hereto.

RAY C. NEWHOUSE. 

